drivers/s390/scsi/zfcp_dbf.c

   1 /*
   2  * zfcp device driver
   3  *
   4  * Debug traces for zfcp.
   5  *
   6  * Copyright IBM Corp. 2002, 2015
   7  */
   8
   9 #define KMSG_COMPONENT "zfcp"
  10 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  11
  12 #include <linux/module.h>
  13 #include <linux/ctype.h>
  14 #include <linux/slab.h>
  15 #include <asm/debug.h>
  16 #include "zfcp_dbf.h"
  17 #include "zfcp_ext.h"
  18 #include "zfcp_fc.h"
  19
  20 static u32 dbfsize = 4;
  21
  22 module_param(dbfsize, uint, 0400);
  23 MODULE_PARM_DESC(dbfsize,
  24                  "number of pages for each debug feature area (default 4)");
  25
  26 static u32 dbflevel = 3;
  27
  28 module_param(dbflevel, uint, 0400);
  29 MODULE_PARM_DESC(dbflevel,
  30                  "log level for each debug feature area "
  31                  "(default 3, range 0..6)");
  32
  33 static inline unsigned int zfcp_dbf_plen(unsigned int offset)
  34 {
  35         return sizeof(struct zfcp_dbf_pay) + offset - ZFCP_DBF_PAY_MAX_REC;
  36 }
  37
  38 static inline
  39 void zfcp_dbf_pl_write(struct zfcp_dbf *dbf, void *data, u16 length, char *area,
  40                        u64 req_id)
  41 {
  42         struct zfcp_dbf_pay *pl = &dbf->pay_buf;
  43         u16 offset = 0, rec_length;
  44
  45         spin_lock(&dbf->pay_lock);
  46         memset(pl, 0, sizeof(*pl));
  47         pl->fsf_req_id = req_id;
  48         memcpy(pl->area, area, ZFCP_DBF_TAG_LEN);
  49
  50         while (offset < length) {
  51                 rec_length = min((u16) ZFCP_DBF_PAY_MAX_REC,
  52                                  (u16) (length - offset));
  53                 memcpy(pl->data, data + offset, rec_length);
  54                 debug_event(dbf->pay, 1, pl, zfcp_dbf_plen(rec_length));
  55
  56                 offset += rec_length;
  57                 pl->counter++;
  58         }
  59
  60         spin_unlock(&dbf->pay_lock);
  61 }
  62
  63 /**
  64  * zfcp_dbf_hba_fsf_res - trace event for fsf responses
  65  * @tag: tag indicating which kind of unsolicited status has been received
  66  * @req: request for which a response was received
  67  */
  68 void zfcp_dbf_hba_fsf_res(char *tag, int level, struct zfcp_fsf_req *req)
  69 {
  70         struct zfcp_dbf *dbf = req->adapter->dbf;
  71         struct fsf_qtcb_prefix *q_pref = &req->qtcb->prefix;
  72         struct fsf_qtcb_header *q_head = &req->qtcb->header;
  73         struct zfcp_dbf_hba *rec = &dbf->hba_buf;
  74         unsigned long flags;
  75
  76         spin_lock_irqsave(&dbf->hba_lock, flags);
  77         memset(rec, 0, sizeof(*rec));
  78
  79         memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
  80         rec->id = ZFCP_DBF_HBA_RES;
  81         rec->fsf_req_id = req->req_id;
  82         rec->fsf_req_status = req->status;
  83         rec->fsf_cmd = req->fsf_command;
  84         rec->fsf_seq_no = req->seq_no;
  85         rec->u.res.req_issued = req->issued;
  86         rec->u.res.prot_status = q_pref->prot_status;
  87         rec->u.res.fsf_status = q_head->fsf_status;
  88         rec->u.res.port_handle = q_head->port_handle;
  89         rec->u.res.lun_handle = q_head->lun_handle;
  90
  91         memcpy(rec->u.res.prot_status_qual, &q_pref->prot_status_qual,
  92                FSF_PROT_STATUS_QUAL_SIZE);
  93         memcpy(rec->u.res.fsf_status_qual, &q_head->fsf_status_qual,
  94                FSF_STATUS_QUALIFIER_SIZE);
  95
  96         if (req->fsf_command != FSF_QTCB_FCP_CMND) {
  97                 rec->pl_len = q_head->log_length;
  98                 zfcp_dbf_pl_write(dbf, (char *)q_pref + q_head->log_start,
  99                                   rec->pl_len, "fsf_res", req->req_id);
 100         }
 101
 102         debug_event(dbf->hba, level, rec, sizeof(*rec));
 103         spin_unlock_irqrestore(&dbf->hba_lock, flags);
 104 }
 105
 106 /**
 107  * zfcp_dbf_hba_fsf_uss - trace event for an unsolicited status buffer
 108  * @tag: tag indicating which kind of unsolicited status has been received
 109  * @req: request providing the unsolicited status
 110  */
 111 void zfcp_dbf_hba_fsf_uss(char *tag, struct zfcp_fsf_req *req)
 112 {
 113         struct zfcp_dbf *dbf = req->adapter->dbf;
 114         struct fsf_status_read_buffer *srb = req->data;
 115         struct zfcp_dbf_hba *rec = &dbf->hba_buf;
 116         unsigned long flags;
 117
 118         spin_lock_irqsave(&dbf->hba_lock, flags);
 119         memset(rec, 0, sizeof(*rec));
 120
 121         memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
 122         rec->id = ZFCP_DBF_HBA_USS;
 123         rec->fsf_req_id = req->req_id;
 124         rec->fsf_req_status = req->status;
 125         rec->fsf_cmd = req->fsf_command;
 126
 127         if (!srb)
 128                 goto log;
 129
 130         rec->u.uss.status_type = srb->status_type;
 131         rec->u.uss.status_subtype = srb->status_subtype;
 132         rec->u.uss.d_id = ntoh24(srb->d_id);
 133         rec->u.uss.lun = srb->fcp_lun;
 134         memcpy(&rec->u.uss.queue_designator, &srb->queue_designator,
 135                sizeof(rec->u.uss.queue_designator));
 136
 137         /* status read buffer payload length */
 138         rec->pl_len = (!srb->length) ? 0 : srb->length -
 139                         offsetof(struct fsf_status_read_buffer, payload);
 140
 141         if (rec->pl_len)
 142                 zfcp_dbf_pl_write(dbf, srb->payload.data, rec->pl_len,
 143                                   "fsf_uss", req->req_id);
 144 log:
 145         debug_event(dbf->hba, 2, rec, sizeof(*rec));
 146         spin_unlock_irqrestore(&dbf->hba_lock, flags);
 147 }
 148
 149 /**
 150  * zfcp_dbf_hba_bit_err - trace event for bit error conditions
 151  * @tag: tag indicating which kind of unsolicited status has been received
 152  * @req: request which caused the bit_error condition
 153  */
 154 void zfcp_dbf_hba_bit_err(char *tag, struct zfcp_fsf_req *req)
 155 {
 156         struct zfcp_dbf *dbf = req->adapter->dbf;
 157         struct zfcp_dbf_hba *rec = &dbf->hba_buf;
 158         struct fsf_status_read_buffer *sr_buf = req->data;
 159         unsigned long flags;
 160
 161         spin_lock_irqsave(&dbf->hba_lock, flags);
 162         memset(rec, 0, sizeof(*rec));
 163
 164         memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
 165         rec->id = ZFCP_DBF_HBA_BIT;
 166         rec->fsf_req_id = req->req_id;
 167         rec->fsf_req_status = req->status;
 168         rec->fsf_cmd = req->fsf_command;
 169         memcpy(&rec->u.be, &sr_buf->payload.bit_error,
 170                sizeof(struct fsf_bit_error_payload));
 171
 172         debug_event(dbf->hba, 1, rec, sizeof(*rec));
 173         spin_unlock_irqrestore(&dbf->hba_lock, flags);
 174 }
 175
 176 /**
 177  * zfcp_dbf_hba_def_err - trace event for deferred error messages
 178  * @adapter: pointer to struct zfcp_adapter
 179  * @req_id: request id which caused the deferred error message
 180  * @scount: number of sbals incl. the signaling sbal
 181  * @pl: array of all involved sbals
 182  */
 183 void zfcp_dbf_hba_def_err(struct zfcp_adapter *adapter, u64 req_id, u16 scount,
 184                           void **pl)
 185 {
 186         struct zfcp_dbf *dbf = adapter->dbf;
 187         struct zfcp_dbf_pay *payload = &dbf->pay_buf;
 188         unsigned long flags;
 189         u16 length;
 190
 191         if (!pl)
 192                 return;
 193
 194         spin_lock_irqsave(&dbf->pay_lock, flags);
 195         memset(payload, 0, sizeof(*payload));
 196
 197         memcpy(payload->area, "def_err", 7);
 198         payload->fsf_req_id = req_id;
 199         payload->counter = 0;
 200         length = min((u16)sizeof(struct qdio_buffer),
 201                      (u16)ZFCP_DBF_PAY_MAX_REC);
 202
 203         while (payload->counter < scount && (char *)pl[payload->counter]) {
 204                 memcpy(payload->data, (char *)pl[payload->counter], length);
 205                 debug_event(dbf->pay, 1, payload, zfcp_dbf_plen(length));
 206                 payload->counter++;
 207         }
 208
 209         spin_unlock_irqrestore(&dbf->pay_lock, flags);
 210 }
 211
 212 /**
 213  * zfcp_dbf_hba_basic - trace event for basic adapter events
 214  * @adapter: pointer to struct zfcp_adapter
 215  */
 216 void zfcp_dbf_hba_basic(char *tag, struct zfcp_adapter *adapter)
 217 {
 218         struct zfcp_dbf *dbf = adapter->dbf;
 219         struct zfcp_dbf_hba *rec = &dbf->hba_buf;
 220         unsigned long flags;
 221
 222         spin_lock_irqsave(&dbf->hba_lock, flags);
 223         memset(rec, 0, sizeof(*rec));
 224
 225         memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
 226         rec->id = ZFCP_DBF_HBA_BASIC;
 227
 228         debug_event(dbf->hba, 1, rec, sizeof(*rec));
 229         spin_unlock_irqrestore(&dbf->hba_lock, flags);
 230 }
 231
 232 static void zfcp_dbf_set_common(struct zfcp_dbf_rec *rec,
 233                                 struct zfcp_adapter *adapter,
 234                                 struct zfcp_port *port,
 235                                 struct scsi_device *sdev)
 236 {
 237         rec->adapter_status = atomic_read(&adapter->status);
 238         if (port) {
 239                 rec->port_status = atomic_read(&port->status);
 240                 rec->wwpn = port->wwpn;
 241                 rec->d_id = port->d_id;
 242         }
 243         if (sdev) {
 244                 rec->lun_status = atomic_read(&sdev_to_zfcp(sdev)->status);
 245                 rec->lun = zfcp_scsi_dev_lun(sdev);
 246         } else
 247                 rec->lun = ZFCP_DBF_INVALID_LUN;
 248 }
 249
 250 /**
 251  * zfcp_dbf_rec_trig - trace event related to triggered recovery
 252  * @tag: identifier for event
 253  * @adapter: adapter on which the erp_action should run
 254  * @port: remote port involved in the erp_action
 255  * @sdev: scsi device involved in the erp_action
 256  * @want: wanted erp_action
 257  * @need: required erp_action
 258  *
 259  * The adapter->erp_lock has to be held.
 260  */
 261 void zfcp_dbf_rec_trig(char *tag, struct zfcp_adapter *adapter,
 262                        struct zfcp_port *port, struct scsi_device *sdev,
 263                        u8 want, u8 need)
 264 {
 265         struct zfcp_dbf *dbf = adapter->dbf;
 266         struct zfcp_dbf_rec *rec = &dbf->rec_buf;
 267         struct list_head *entry;
 268         unsigned long flags;
 269
 270         spin_lock_irqsave(&dbf->rec_lock, flags);
 271         memset(rec, 0, sizeof(*rec));
 272
 273         rec->id = ZFCP_DBF_REC_TRIG;
 274         memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
 275         zfcp_dbf_set_common(rec, adapter, port, sdev);
 276
 277         list_for_each(entry, &adapter->erp_ready_head)
 278                 rec->u.trig.ready++;
 279
 280         list_for_each(entry, &adapter->erp_running_head)
 281                 rec->u.trig.running++;
 282
 283         rec->u.trig.want = want;
 284         rec->u.trig.need = need;
 285
 286         debug_event(dbf->rec, 1, rec, sizeof(*rec));
 287         spin_unlock_irqrestore(&dbf->rec_lock, flags);
 288 }
 289
 290
 291 /**
 292  * zfcp_dbf_rec_run - trace event related to running recovery
 293  * @tag: identifier for event
 294  * @erp: erp_action running
 295  */
 296 void zfcp_dbf_rec_run(char *tag, struct zfcp_erp_action *erp)
 297 {
 298         struct zfcp_dbf *dbf = erp->adapter->dbf;
 299         struct zfcp_dbf_rec *rec = &dbf->rec_buf;
 300         unsigned long flags;
 301
 302         spin_lock_irqsave(&dbf->rec_lock, flags);
 303         memset(rec, 0, sizeof(*rec));
 304
 305         rec->id = ZFCP_DBF_REC_RUN;
 306         memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
 307         zfcp_dbf_set_common(rec, erp->adapter, erp->port, erp->sdev);
 308
 309         rec->u.run.fsf_req_id = erp->fsf_req_id;
 310         rec->u.run.rec_status = erp->status;
 311         rec->u.run.rec_step = erp->step;
 312         rec->u.run.rec_action = erp->action;
 313
 314         if (erp->sdev)
 315                 rec->u.run.rec_count =
 316                         atomic_read(&sdev_to_zfcp(erp->sdev)->erp_counter);
 317         else if (erp->port)
 318                 rec->u.run.rec_count = atomic_read(&erp->port->erp_counter);
 319         else
 320                 rec->u.run.rec_count = atomic_read(&erp->adapter->erp_counter);
 321
 322         debug_event(dbf->rec, 1, rec, sizeof(*rec));
 323         spin_unlock_irqrestore(&dbf->rec_lock, flags);
 324 }
 325
 326 /**
 327  * zfcp_dbf_rec_run_wka - trace wka port event with info like running recovery
 328  * @tag: identifier for event
 329  * @wka_port: well known address port
 330  * @req_id: request ID to correlate with potential HBA trace record
 331  */
 332 void zfcp_dbf_rec_run_wka(char *tag, struct zfcp_fc_wka_port *wka_port,
 333                           u64 req_id)
 334 {
 335         struct zfcp_dbf *dbf = wka_port->adapter->dbf;
 336         struct zfcp_dbf_rec *rec = &dbf->rec_buf;
 337         unsigned long flags;
 338
 339         spin_lock_irqsave(&dbf->rec_lock, flags);
 340         memset(rec, 0, sizeof(*rec));
 341
 342         rec->id = ZFCP_DBF_REC_RUN;
 343         memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
 344         rec->port_status = wka_port->status;
 345         rec->d_id = wka_port->d_id;
 346         rec->lun = ZFCP_DBF_INVALID_LUN;
 347
 348         rec->u.run.fsf_req_id = req_id;
 349         rec->u.run.rec_status = ~0;
 350         rec->u.run.rec_step = ~0;
 351         rec->u.run.rec_action = ~0;
 352         rec->u.run.rec_count = ~0;
 353
 354         debug_event(dbf->rec, 1, rec, sizeof(*rec));
 355         spin_unlock_irqrestore(&dbf->rec_lock, flags);
 356 }
 357
 358 static inline
 359 void zfcp_dbf_san(char *tag, struct zfcp_dbf *dbf, void *data, u8 id, u16 len,
 360                   u64 req_id, u32 d_id)
 361 {
 362         struct zfcp_dbf_san *rec = &dbf->san_buf;
 363         u16 rec_len;
 364         unsigned long flags;
 365
 366         spin_lock_irqsave(&dbf->san_lock, flags);
 367         memset(rec, 0, sizeof(*rec));
 368
 369         rec->id = id;
 370         rec->fsf_req_id = req_id;
 371         rec->d_id = d_id;
 372         rec_len = min(len, (u16)ZFCP_DBF_SAN_MAX_PAYLOAD);
 373         memcpy(rec->payload, data, rec_len);
 374         memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
 375
 376         debug_event(dbf->san, 1, rec, sizeof(*rec));
 377         spin_unlock_irqrestore(&dbf->san_lock, flags);
 378 }
 379
 380 /**
 381  * zfcp_dbf_san_req - trace event for issued SAN request
 382  * @tag: identifier for event
 383  * @fsf_req: request containing issued CT data
 384  * d_id: destination ID
 385  */
 386 void zfcp_dbf_san_req(char *tag, struct zfcp_fsf_req *fsf, u32 d_id)
 387 {
 388         struct zfcp_dbf *dbf = fsf->adapter->dbf;
 389         struct zfcp_fsf_ct_els *ct_els = fsf->data;
 390         u16 length;
 391
 392         length = (u16)(ct_els->req->length);
 393         zfcp_dbf_san(tag, dbf, sg_virt(ct_els->req), ZFCP_DBF_SAN_REQ, length,
 394                      fsf->req_id, d_id);
 395 }
 396
 397 /**
 398  * zfcp_dbf_san_res - trace event for received SAN request
 399  * @tag: identifier for event
 400  * @fsf_req: request containing issued CT data
 401  */
 402 void zfcp_dbf_san_res(char *tag, struct zfcp_fsf_req *fsf)
 403 {
 404         struct zfcp_dbf *dbf = fsf->adapter->dbf;
 405         struct zfcp_fsf_ct_els *ct_els = fsf->data;
 406         u16 length;
 407
 408         length = (u16)(ct_els->resp->length);
 409         zfcp_dbf_san(tag, dbf, sg_virt(ct_els->resp), ZFCP_DBF_SAN_RES, length,
 410                      fsf->req_id, ct_els->d_id);
 411 }
 412
 413 /**
 414  * zfcp_dbf_san_in_els - trace event for incoming ELS
 415  * @tag: identifier for event
 416  * @fsf_req: request containing issued CT data
 417  */
 418 void zfcp_dbf_san_in_els(char *tag, struct zfcp_fsf_req *fsf)
 419 {
 420         struct zfcp_dbf *dbf = fsf->adapter->dbf;
 421         struct fsf_status_read_buffer *srb =
 422                 (struct fsf_status_read_buffer *) fsf->data;
 423         u16 length;
 424
 425         length = (u16)(srb->length -
 426                         offsetof(struct fsf_status_read_buffer, payload));
 427         zfcp_dbf_san(tag, dbf, srb->payload.data, ZFCP_DBF_SAN_ELS, length,
 428                      fsf->req_id, ntoh24(srb->d_id));
 429 }
 430
 431 /**
 432  * zfcp_dbf_scsi - trace event for scsi commands
 433  * @tag: identifier for event
 434  * @sc: pointer to struct scsi_cmnd
 435  * @fsf: pointer to struct zfcp_fsf_req
 436  */
 437 void zfcp_dbf_scsi(char *tag, int level, struct scsi_cmnd *sc,
 438                    struct zfcp_fsf_req *fsf)
 439 {
 440         struct zfcp_adapter *adapter =
 441                 (struct zfcp_adapter *) sc->device->host->hostdata[0];
 442         struct zfcp_dbf *dbf = adapter->dbf;
 443         struct zfcp_dbf_scsi *rec = &dbf->scsi_buf;
 444         struct fcp_resp_with_ext *fcp_rsp;
 445         struct fcp_resp_rsp_info *fcp_rsp_info;
 446         unsigned long flags;
 447
 448         spin_lock_irqsave(&dbf->scsi_lock, flags);
 449         memset(rec, 0, sizeof(*rec));
 450
 451         memcpy(rec->tag, tag, ZFCP_DBF_TAG_LEN);
 452         rec->id = ZFCP_DBF_SCSI_CMND;
 453         rec->scsi_result = sc->result;
 454         rec->scsi_retries = sc->retries;
 455         rec->scsi_allowed = sc->allowed;
 456         rec->scsi_id = sc->device->id;
 457         /* struct zfcp_dbf_scsi needs to be updated to handle 64bit LUNs */
 458         rec->scsi_lun = (u32)sc->device->lun;
 459         rec->host_scribble = (unsigned long)sc->host_scribble;
 460
 461         memcpy(rec->scsi_opcode, sc->cmnd,
 462                min((int)sc->cmd_len, ZFCP_DBF_SCSI_OPCODE));
 463
 464         if (fsf) {
 465                 rec->fsf_req_id = fsf->req_id;
 466                 fcp_rsp = (struct fcp_resp_with_ext *)
 467                                 &(fsf->qtcb->bottom.io.fcp_rsp);
 468                 memcpy(&rec->fcp_rsp, fcp_rsp, FCP_RESP_WITH_EXT);
 469                 if (fcp_rsp->resp.fr_flags & FCP_RSP_LEN_VAL) {
 470                         fcp_rsp_info = (struct fcp_resp_rsp_info *) &fcp_rsp[1];
 471                         rec->fcp_rsp_info = fcp_rsp_info->rsp_code;
 472                 }
 473                 if (fcp_rsp->resp.fr_flags & FCP_SNS_LEN_VAL) {
 474                         rec->pl_len = min((u16)SCSI_SENSE_BUFFERSIZE,
 475                                           (u16)ZFCP_DBF_PAY_MAX_REC);
 476                         zfcp_dbf_pl_write(dbf, sc->sense_buffer, rec->pl_len,
 477                                           "fcp_sns", fsf->req_id);
 478                 }
 479         }
 480
 481         debug_event(dbf->scsi, level, rec, sizeof(*rec));
 482         spin_unlock_irqrestore(&dbf->scsi_lock, flags);
 483 }
 484
 485 static debug_info_t *zfcp_dbf_reg(const char *name, int size, int rec_size)
 486 {
 487         struct debug_info *d;
 488
 489         d = debug_register(name, size, 1, rec_size);
 490         if (!d)
 491                 return NULL;
 492
 493         debug_register_view(d, &debug_hex_ascii_view);
 494         debug_set_level(d, dbflevel);
 495
 496         return d;
 497 }
 498
 499 static void zfcp_dbf_unregister(struct zfcp_dbf *dbf)
 500 {
 501         if (!dbf)
 502                 return;
 503
 504         debug_unregister(dbf->scsi);
 505         debug_unregister(dbf->san);
 506         debug_unregister(dbf->hba);
 507         debug_unregister(dbf->pay);
 508         debug_unregister(dbf->rec);
 509         kfree(dbf);
 510 }
 511
 512 /**
 513  * zfcp_adapter_debug_register - registers debug feature for an adapter
 514  * @adapter: pointer to adapter for which debug features should be registered
 515  * return: -ENOMEM on error, 0 otherwise
 516  */
 517 int zfcp_dbf_adapter_register(struct zfcp_adapter *adapter)
 518 {
 519         char name[DEBUG_MAX_NAME_LEN];
 520         struct zfcp_dbf *dbf;
 521
 522         dbf = kzalloc(sizeof(struct zfcp_dbf), GFP_KERNEL);
 523         if (!dbf)
 524                 return -ENOMEM;
 525
 526         spin_lock_init(&dbf->pay_lock);
 527         spin_lock_init(&dbf->hba_lock);
 528         spin_lock_init(&dbf->san_lock);
 529         spin_lock_init(&dbf->scsi_lock);
 530         spin_lock_init(&dbf->rec_lock);
 531
 532         /* debug feature area which records recovery activity */
 533         sprintf(name, "zfcp_%s_rec", dev_name(&adapter->ccw_device->dev));
 534         dbf->rec = zfcp_dbf_reg(name, dbfsize, sizeof(struct zfcp_dbf_rec));
 535         if (!dbf->rec)
 536                 goto err_out;
 537
 538         /* debug feature area which records HBA (FSF and QDIO) conditions */
 539         sprintf(name, "zfcp_%s_hba", dev_name(&adapter->ccw_device->dev));
 540         dbf->hba = zfcp_dbf_reg(name, dbfsize, sizeof(struct zfcp_dbf_hba));
 541         if (!dbf->hba)
 542                 goto err_out;
 543
 544         /* debug feature area which records payload info */
 545         sprintf(name, "zfcp_%s_pay", dev_name(&adapter->ccw_device->dev));
 546         dbf->pay = zfcp_dbf_reg(name, dbfsize * 2, sizeof(struct zfcp_dbf_pay));
 547         if (!dbf->pay)
 548                 goto err_out;
 549
 550         /* debug feature area which records SAN command failures and recovery */
 551         sprintf(name, "zfcp_%s_san", dev_name(&adapter->ccw_device->dev));
 552         dbf->san = zfcp_dbf_reg(name, dbfsize, sizeof(struct zfcp_dbf_san));
 553         if (!dbf->san)
 554                 goto err_out;
 555
 556         /* debug feature area which records SCSI command failures and recovery */
 557         sprintf(name, "zfcp_%s_scsi", dev_name(&adapter->ccw_device->dev));
 558         dbf->scsi = zfcp_dbf_reg(name, dbfsize, sizeof(struct zfcp_dbf_scsi));
 559         if (!dbf->scsi)
 560                 goto err_out;
 561
 562         adapter->dbf = dbf;
 563
 564         return 0;
 565 err_out:
 566         zfcp_dbf_unregister(dbf);
 567         return -ENOMEM;
 568 }
 569
 570 /**
 571  * zfcp_adapter_debug_unregister - unregisters debug feature for an adapter
 572  * @adapter: pointer to adapter for which debug features should be unregistered
 573  */
 574 void zfcp_dbf_adapter_unregister(struct zfcp_adapter *adapter)
 575 {
 576         struct zfcp_dbf *dbf = adapter->dbf;
 577
 578         adapter->dbf = NULL;
 579         zfcp_dbf_unregister(dbf);
 580 }
 581